Waste Water Engineering
The sewer pipes

Should resist the wear and tear caused due to abrasion
All listed here
Carry sewage as gravity conduits
Are designed for generating self-cleansing velocities at different discharge

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Waste Water Engineering
In the activated sludge process

Aeration is done with an admixture of previously aerated sludge
Water is removed by centrifugal action
Sludge is activated by constant stirring
Aeration is continued till stability

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